Rotary Actuators
Rotary actuators are compact, simple, and efficient linear actuators that rotate an output shaft through a fixed arc to produce oscillating power. They require limited space and simple mountings and can produce high instant torque in either direction. Rotary actuators are used for lifting, lowering, opening, closing, indexing, and transferring movements. The various forms of energy that run rotary actuators include hydraulic, pneumatic, and electrical.
Hydraulic rotary actuators use pressurized fluid to turn motorized components. Either a circular shaft or a table can be used as the rotational element. Hydraulic rotary actuators are faster and stronger than pneumatic rotary actuators. They are often used for steering or as an alternative to hydraulic cylinders or motors.
Pneumatic rotary actuators use pressurized air to turn motorized components. Types of pneumatic rotary actuators include single rotary vane devices, double rotary vane devices, multi-motion rotary vane actuators, single rack-and-pinion actuators, and double or four piston rack-and-pinion actuators. Pneumatic rotary actuators can be used in material handling, product assembly, testing and quality control, packing, welding, and machine loading and unloading.
Electric rotary actuators rotate from open to close using butterfly, ball, and plug valves. With the use of electric rotary actuators, the electromagnetic power from the motor causes the components to rotate, allowing for numerous stops during each stroke. Either a circular shaft or a table can be used as the rotational element. When selecting a rotary electric actuator, important factors to consider include actuator torque and range of motion. The actuator torque refers to the power that causes the rotation, while the full range of motion can be either nominal, quarter-turn, or multi-turn.